Learn what "subjective" means.If you voted Leave in 2016 and then in 2019 suddenly learned that God does in fact exist and has decided that if we Brexit we're all going to spend eternity getting assfucked by the ghost of Tutankhamen, would you say 'oh well hurr durr i didn't know that when I voted yes but still, that was fair and square so i guess i better bend over'?
Because there's no "proof of god" evidence I'm aware of.